There are a few things that can be done in times of grave emergencies. Your mobile phone can actually be a life saver or an emergency tool for survival.
Check out the things that you can do:

Emergency
The Emergency Number worldwide for all Mobile Phones is 112. If you find yourself out of the coverage area of your mobile network and there is an
emergency, dial 112 and your mobile will search any existing network in your area to establish the emergency number for you, and interestingly this
number 112 can be dialled even if the keypad is locked. This works on all phones worldwide and is free.

Have you locked your keys in the car?
Does your car have remote keyless entry? If you lock your keys in the car just call someone at home on their mobile phone from your mobile.
Hold your mobile phone about a foot from your car door and have the person at your home press the unlock button, holding it near their mobile phone
on their end. Your car will unlock. Saves someone from having to drive your keys to you. Distance is no object.
You could be thousands of miles away, and if you can reach someone who has the other 'remote' for your car, you can unlock the doors (or the trunk).

Hidden Battery Power
To activate, press the keys *3370# (remember the asterisk). Do this when the phone is almost dead. Your mobile will restart in a special way with this
new reserve and the instrument will show a 50% increase in battery life. This reserve will get recharged when you charge your mobile next time.

How to Disable a STOLEN Mobile Phone
To check your Mobile phone's serial number, key in the following digits on your phone: *#06# Ensure you put an asterisk BEFORE
the #06# sequence. A 15 digit code will appear on the screen. This number is unique to your handset. Write it down and keep it somewhere safe.
If your phone ever gets stolen, you can phone your service provider and give them this code. They will then be able to block your handset so even if
the thief changes the SIM card, your phone will be totally useless. You probably won't get your phone back, but at least you know that whoever stole
it can't use/sell it either. If everybody did this, there would be no point in people stealing mobile phones, it was created to prevent phones from being stolen.

ATM PIN Number Reversal

If you should ever be forced by a robber to withdraw money from an ATM machine, you can notify the police by entering your PIN # in reverse.
For example, if your pin number is 1234, then you would put in 4321. The ATM system recognizes that your PIN number is backwards from the ATM
card you placed in the machine. The machine will still give you the money you requested, but unknown to the robber, the police will be immediately
dispatched to the location. All ATMís carry this emergency sequencer by law.